Malicious PDF — malware analysis report

Static analysis result for SHA-256 5417cef420a9c130…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 04:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfe2b6b1783c0307dc4b9c69990cc8fd SHA-1: cf1fbf99ce986e6c21a34de4d836b1647d98c42a SHA-256: 5417cef420a9c13047db4dea59fa8a3e189307883907895c0893cae8e25ccac4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of distinct hosts used for linking. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to deliver malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cyclad.org/UserFiles/file/17824931733.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/75611402550.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/21610551585.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bilunamizonof.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/22357883980.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430d53d1b4e---pasujoji.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/61403463338.pdfIn PDF document text
    • http://jfe.hk/userfiles/76124239887.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/55858800401.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/22270585487.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/80732021062.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/96508088993.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/76661416292.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/daxevizonavolumized.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/49535876998.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/kewokikopuku.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/21203188717.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///fakawinozopizuxas.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/gijadegokevewuru.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kifemaredefaminawija.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/kopakuraxexemolezakukug.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109011100112630.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/wegexotuvemam.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/vuterigeginededunevi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/zigapiwajabepekawuwobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=viewstub+android+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40F 19996 bytes
SHA-256: 02da1342254875fc1069dabbde1c3739baee0170d840c044b52ba00911ba2ec6
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10948 bytes
SHA-256: ad276429fb84199237738bc76249c66ce666054b037f761ac1af764bbc7c16ba
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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